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well the definition of the word Lavage means to "wash out an organ" so lavage of the maxillary sinus mean to wash out the maxillary sinus.
paranasal sinus include frontal sinus, the maxillary sinus, the ethmodial sinuses, and the spheniodal sinus.
The maxillary sinus
The maxillary sinus
No mastoid and maxillary sinus are two different bones
frontal nasal bone
It means there is fluid in that sinus. You have a right & a left maxillary sinus. Sometimes one can be worse than the other or only one can be infected.
Antrostomy means surgical creation of an artificial opening into the maxillary sinus.
paranasal sinus include frontal sinus, the maxillary sinus, the ethmodial sinuses, and the spheniodal sinus.
Sinus
Antrostomy is the medical term meaning surgical creation of an artificial opening into the maxillary sinus.
Mucoperiosteal reaction = sinus wall thickening. Typically this is secondary to chronic sinus opacification (Chronic rhionosinusitis).